KLKB1 and neoplasm: Our results indicated that the expression of KLKB1 (P < 0.01), IL13RA2 (P < 0.01), ABCC8 (P < 0.01), and PART1 (P < 0.0001) was consistent with our bioinformatics analysis, which was significantly up-regulated in PanNETs compared with the non-tumor tissues.